Safety device for stamping and punching presses.



.5. MNZ.

SAFETY DEVlGE FOR STAMPING AND PUNCHING PRESSES.

' APPLICATIDN FILED MAY 4. 19m.

Patented. 1M5, 1918,

2 SHEETS-SHEET I.

11. MNL SAFEIY DEVICE FOR smwwme AND PUNCHINQ'PRESSES.

APE'LICATION FILED MAM/4.1918.

Patented Nov. 5, 1918.

2 SHEETS-SHEET 2.

0.. WASHINGTON. a. c,

lUhT

JACOB IRANZ, OF ST. LOUIS, MISSOURI.

SAFETY DEVICE FOR STAMPING AND PUNCHING PRESSES.

Application filed May 4-, 1918. Serial No. 232.4271.

To all whom it may concern."

Be it known that l, JACOB RANz, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Safety Devices for Stamping and Punching Presses, of which the following is afull, clear, and eXact description, such aswill enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification.

My invention relates to a safety device particularly designed for use upon punching and stamping presses and like machines, the principal object of my invention being to provide a relatively simple and compact device which can be readily applied to practically all forms of punching and stamping presses and which will be effective in preventing the hands of the operator from get ting into positions ofdanger between the punch and die, and said device being construoted so that the operator can at all times readily observe the action of the punch and die and likewise the condition of the work or material which is being acted upon.

A further object of my invention is to provide a safety device which can be easily and quickly adjusted to suit conditions and likewise to suit punches and dies of variable sizes; further, to provide a device which is wholly independent of the foot or hand lever controlling the operation of the punching or stamping press, and further, to provide a safety device which is wholly effective without depending on some action by the operator and therefore leaving the operators hands free to manipulate the work into and out of position relative to the punch and die.

With the foregoing and other objects in view, my invention consists in certain novel features of construction and arrangement of parts, hereinafter more fully described and claimed, and illustrated in the accompanying drawings, in which i Figure 1 isanelevational. view of the up- Specificatton of Letters IE'atent.

per portion of a stamping or punching press,fthe same being equipped with a safety device of my improved construction. F 2 is a front elevational view of my improved safety device.

Fig. 3 is an enlarged detail section taken approximately on. the line 3--3 of Fig. 1.

Fig. 4 is an enlarged detail section taken approximately onthe line 4. 1. of Fig. 2.

Fig. 5 is a perspective view of one of a series of overlapping plates and which plates form the sides of the guard or safety device.

Fig. dis a perspective view ofone of the slotted or perforated plates which forms the front of the guard or safety device.

Fig. 7 is an enlarged elevational view of one of the sets of side plates forming a part of my improved guard.

Referring by numerals to the accompanying drawings, which illustrate a practical embodiment of my invention, 10 designates theframe of a punching or stamping press, 11 the table thereof, 12 the die, 13 the stripper, l-t the ram, and 15 the punch carried by said ram and which punch moves downward in the usual manner into or through the die 12. It will be understood that all of the parts just mentioned are of ordinary and well-known construction and that in order to protectthe hands of the operator from injury, it is essential that "a suitable safety device or in front of and to the sides of the punch and its path of travel. i

The supporting means for my improved guard comprises a bracket 16 which is se cured in any suitable manner to one side of a part of the frame of the machine, prefer ably that portion of theframe which is immediately to the rear of the vertical guides for the ram. The upper portion of this bracket is bifurcatedto form a bearing 17 which latter receives a trunnion 18, the same projecting laterally from a substantially U- shaped block 19.

A. screw or bolt 20 passes through the parts of the bracketlti above bearing 17 andiserves Patented Nov. 5, twin.

guard be positioned the block 19.

to draw said parts together, thereby clamping the trunnion 18 and retaining it in fixed position after adjustment.

A hearing 21 is formed in the lower portion of the block 19, said bearing receiving a horizontally disposed rod 22 and this rod being gripped and fixedly held in its adjusted position by a bolt or screw 23 which latter passes through the upper portions of The rod 22 which normally lies alongside one of the fixed guides for the ram 14 can be adjusted lengthwise in either direction by loosening the bolt or set screw 23 and the outer end of said rod which carries my improved guard can be raised or lowered as desired, by loosening the bolt or set screw 20 and rocking the trunnion 18 in its bearing. 2

One end of a block 24: is slotted for a short distance lengthwise and formed at the inner end of said slot is a bearing 25 which receives the rod 22. Passing through the slotted end of this block outside the bearing is a screw or bolt 26 which, when tightened, grips said rod 22, thereby retaining said block-in fixed position after adjustment upon said rod. Fixed to this block is a horizontally disposed rail 27 which extends across the machine in front of the guides for the ram and formed in this rail is a longitudinally disposed slot 28 open at the ends and bottom and preferably of inverted L shape. Y

Formed through the wall of this rail in front of said slot is a series of threaded apertures 29 which are adapted to receive thethreaded shanks of winged nuts or set screws such as 80. The front member of my improved guard is composed of one or more plates 31 of sheet metal or the like, the same being perforated in any suitable manner, but preferably with vertically dis-. posed parallel slots such as 32. The lower portion 33 of each plate is bent inwardly so that it occupies an angle relative tothe vertical plane occupied by the upper portion and the upper edge of each plate is bent into a substantially horizontal plane to form-a flange 34 which latter occupies the upper portion of the inverted L-shagped slot 28 in rail 27.

When my improved guard is in proper position upon a press and the rail 27 is properly adjusted, the lower edge of the in? clined portion 83 of the plate 31 occupies a position immediately adjacent to the front edge of the stripper 13. When the plate 31 has been properly adjusted lengthwiseupon rail 27 one or more set screws or winged nuts 30 are utilized in the apertures 29 for locking said plate 31 in its adjusted position. Obviously,-these plates 31 can be made in various sizes, and on a-press having a relatively wide punch and die, the front. guard can be made up from two or more of the slotted plates.

Each of the guards utilized to the sides of the punch comprises a series of relatively thin plates 35, the same being provided with relatively small apertures or slots and each series of plates being arranged side by side so as to fold together after the manner of the leaves or members of a folding fan. The rear portions, of these foraminous plates are positioned between the side portions of the stripper 1 3 and the underside of the rain or punch carrying member 14, and the outer ends of each set or series of plates are pivotally supported upon a pin or bolt so, the latter being seated in the lower portion of a vertically disposed member 37, preferably an angle bar. The ends of the plates adjacent to their pivotal points are pro vided with short fingers such as 38. said fingers lying between the laterally bent ends 39 of a torsional spring, the body portion 10 of which is coiled once or twice around the corresponding pin or bolt 36. By this construction, the free ends of the plates 35 or the relatively wide perforated portions tend to unfold or spread apart with the result that the upper edge of one of said plates normally bears directly against the underside of the ram 1 while the lower edge of the opposite plate of the series inn'mally bears directly on top of the stripper 13.

As the ram carrying the punch descends, the bodies of the 'foraminous plates will be folded together, against the resistance offered by the corresponding spring 4-0, and as the ram ascends, the spring willact to unfold or separate the plates.

The upper portions of the members 37 are fixed-to plates ll and the upper edges of these plates are bent into substantially horizontal planes to form flanges 12 which occupy the upper portions of the slots 28. These plates 41 can be adjusted lengthwise upon rail 27 and can be locked in their adjusted positions by means of the winged nuts 30. Thus an effective safety device is provided, and owing to the arrangement of the perforated plate 81 and the hinge or folding plates 35, it is practically impossible for the operators hands to be placed in positions of danger between the punch and die, and consequently, the operators hands can be utilized for the manipulation of the work or material being acted upon, and at the same time the operator can readily observe theaction of the punch and die upon said material.

My improved safety device can be easily and quickly adjusted to suit different requirements and difierent sized punches and dies, is in nowise dependent upon some part ofthe press or upon some action of the op messes T eratorto be effective, and consequently said I device is l-practically automatic in performrial into position beneath. the punch or to manipulate the control lever of thepress on j which the guard is mounted.

The slot 28 in railz27 is open at both ends in order that the upper portions of plates tl and foraminous guard plate 31 can be readily inserted in said slot from either end, such arrangement facilitating assembling and adjustment of the parts. In the event that it becomes necessary to adjust the punch and die or change the same, bolt 20 is loosened to release grip upon trunnion 18 and the forward end of a rod 22 is now engaged and swung upward carrying with it parts of the guard and the parts can be maintained in their elevated positions by tightening bolt 20. By loosening bolt 26, block 24 and parts carried thereby can be readily removed from rod 22 or if it is desired to remove said last mentioned rod, bolt 23 is loosened.

A safety device of my improved construction can be easily and cheaply manufactured, and provides a relatively simple and highly efi'ective guard for all forms of punching and stamping presses.

It will be readily understood that minor changes in the size, form and construction of the various parts of my improved safety device can be made and substituted for those herein shown and described, without departing from the spirit of my invention, the scope of which is set forth in the appended claims.

l[ claim:

1. The combination with a stamping press or like machine, of a support, a foraminous guard plate carried by said support and disposed in front of the ram of the machine, and a plurality of foraminous plates pivotally mounted on the support and arranged to the sides of the ram and tool carried thereby.

2. The combination with a stamping press or like machine, of a support, a foraminous guard plate carried by said support and disposed in front of the ram of the machine,

and a plurality of foraminous plates pivotally mounted on the support and arranged to the sides of the ram and tool carried thereby, which plates are adapted to be folded together by the ram as the same descends.

3. The combination with astamping press ried thereby, which plates are adapted to be folded together by the ram as the same clescends, and means for causing the side plates to unfold or open as the ram ascends.

4. A safety device of the class described comprising a support adapted to be adjustably applied to a punch press or like machine, a foraminous plate adjustably carried by said support and disposed in front of :the reciprocating tool carrying member of the machine, and foraminous guard plates pivotally mounted on the adjustable support to the sides of thereciprocating tool carrying member.

5. A safety device of the class described comprising a support adapted to be adjustably applied to a punch press or like machine, a foraminous plate adjustably carried by said support and disposed in front of the reciprocating tool carrying member of the machine, and a plurality of spring supported guard plates adjustably carried by said support and arranged on each side of said tool carrying member.

6. A device of the class described comprising a supporting member adapted to be adjustably applied to a punch press or the like, a rail adjustably positioned on said adjustablesupporting member, and a foraminous guard plate adjustably supported by said rail in front of the reciprocating tool carrying member of the machine.

7. The combination with a punch press or like machine, of a supporting member ad justably arranged on said machine. and a gaiard member carried by said adjustable supporting member, which guard member comprises a plurality of s ring-held plates arranged immediately adjacent to each other and adapted to be folded together by a movable part of the press.

8. The combination with a punch press or like machine, of a supporting member adjustably arranged on said machine, a guard member carried by said adjustable supporting member, which guard member comprises a plurality of spring-held plates arranged immediately adjacent to each other and adapted to be folded together by a movable part of the press, and a foraminous guard plate arranged adjacent to the folding plates.

9. A. safety device of the class described comprising a support adapted to be applied to a punch press or like machine, a guard plate carried by said support and disposed in front of the active tools of the machine, and pivotally mounted plates carried by said support and arranged to the sides of said tools.

10. In a safety device of the class described a support adapted to be applied to a punch press or like machine, a slotted rail carried by said support, a guard plate hav mgo'ne end positioned in the slot in said rail, dependingsupporting members loosely mounted in the slot in said rail, and guard plates pivotally connected to each depending supporting member 11. In a safety device of the class described, a support adapted to be applied to a punch press or like machine, a slotted rail carried by said support, aguard plate 10 having one end positioned in'the slot in said rail, depending supporting members loosely mounted in the slot in said rail, and a plurality of spring-held guard plates pivotally connected to each depending supporting member, which guard plates are adapted to fold together.

In testimony whereof I hereunto afiix my signature this 1st day of May, 1918.

JACOB RANZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G. 

